Patent US2251874A successfully refreshed from Google Patents.
Patent US2277661A successfully refreshed from Google Patents.
US2277661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary fluid pressure motor, pump, and the like
Assignee: Keelavite Co Ltd
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Filing: 1939-01-19
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Granted: 1942-03-31
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Expires: 1959-01-19
Abstract
No abstract record available.
Inventors
- 👤 Booth Melville Bertram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:14
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/14; F04C2/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-03-30 | 1945-09-29 | 1946-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-03-30 | 1949-09-29 | 1950-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-03-30 | 1953-09-29 | 1954-03-31 | $7700.00 | Window Closed / Lapsed |